The radiated electromagnetic interference (EMI)simulation model of the wiper motor inside automobile is presented by using simulation software HFSS. The radiated EMI theory of the wiper motor is analyzed and the radiated EMI simulation model of the wiper motor inside automobile is established. Automobile body is broken down into several simple modules whose key point coordinates are extracted from the imported CAD model，then these modules’ initial meshing are generated and combined into the finite element mesh model of automobile. The simulation results can be obtained with enough accuracy requirements through adaptive meshing. The simulation results coincide well with experimental results, which shows that the established simulation model is correct and it can be used for predicting the radiated EMI of the wiper motor inside automobile. This research method has high versatility and a good reference value for the radiated EMI simulation of other electrical components or subsystem inside automobile.